Which option is an element A: carbon dioxide B: Water C: Air D: Carbon

Chemistry

2 answers:

7nadin3 [17]3 years ago

5 0

Answer:

carbon is an element (D)

Explanation:

An element is a substance composed of a single type of atom. In this case, only carbon is an element.

Ivenika [448]3 years ago

3 0

Answer:

D: Carbon

Explanation:

The periodic table lists all the known elements. When looking at it, the only choice you will find is carbon. Therefore, carbon is the element.

Carbon is also by itself, just C.

Water is H2O, which is a molecule due to the 2 different elements.

Carbon Dioxide is CO2, which is a molecule due to the 2 different elements.

Air is just a mixture of different gas molecules, so therefore it is not an element.

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Explanation:

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3 years ago

How many grams of Na2O are produced when 70.7 g of Na reacts?<br> 4Na(s)+O2(g)→2Na2O(s)

LUCKY_DIMON [66]

Answer:

95.3 grams.

Explanation:

Relative atomic mass data from a modern periodic table:

Na: 22.990;
O: 15.999.

How many moles of Na are consumed?

$M(\mathrm{Na}) = \rm 22.990\; g\cdot mol^{-1}$ .

$\displaystyle n(\mathrm{Na}) = \frac{m(\mathrm{Na})}{M(\mathrm{Na})} = \rm \frac{70.7\; g}{22.990\;g\cdot mol^{-1}}=3.07525\;mol$ .

How many moles of $\mathrm{Na_2 O}$ formula units will be produced?

Consider the ratio between the coefficient of $\mathrm{Na_2 O}$ and that of $\mathrm{Na}$ in the equation:

$\displaystyle \frac{n(\mathrm{Na_2 O})}{n(\mathrm{Na})} = \frac{2}{4} = \frac{1}{2}$ .

As a result,

$\displaystyle n(\mathrm{Na_2 O}) = n(\mathrm{Na}) \cdot \frac{n(\mathrm{Na_2 O})}{n(\mathrm{Na})} = \rm \frac{1}{2}\times 3.07525\;mol = 1.53763\; mol$ .